Article (Scientific journals)
Superparamagnetic colloids in viscous fluids
Darras, Alexis; Opsomer, Eric; Vandewalle, Nicolas et al.
2017In Scientific Reports, 7, p. 7778
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Keywords :
Fluid dynamics; Chemical physics; statistical physics, thermodynamics and nonlinear dynamics
Abstract :
[en] The influence of a magnetic field on the aggregation process of superparamagnetic colloids has been well known on short time for a few decades. However, the influence of important parameters, such as viscosity of the liquid, has received only little attention. Moreover, the equilibrium state reached after a long time is still challenging on some aspects. Indeed, recent experimental measurements show deviations from pure analytical models in extreme conditions. Furthermore, current simulations would require several years of computing time to reach equilibrium state under those conditions. In the present paper, we show how viscosity influences the characteristic time of the aggregation process, with experimental measurements in agreement with previous theories on transient behaviour. Afterwards, we performed numerical simulations on equivalent systems with lower viscosities. Below a critical value of viscosity, a transition to a new aggregation regime is observed and analysed. We noticed this result can be used to reduce the numerical simulation time from several orders of magnitude, without modifying the intrinsic physical behaviour of the particles. However, it also implies that, for high magnetic fields, granular gases could have a very different behaviour from colloidal liquids.
Research center :
CESAM - Complex and Entangled Systems from Atoms to Materials - ULiège
Disciplines :
Physics
Author, co-author :
Darras, Alexis ;  Université de Liège > Département de physique > Physique expér. de la matière molle et des syst. complexes
Opsomer, Eric  ;  Université de Liège > Département de physique > Physique statistique
Vandewalle, Nicolas  ;  Université de Liège > Département de physique > Physique statistique
Lumay, Geoffroy ;  Université de Liège > Département de physique > Physique expér. de la matière molle et des syst. complexes
Language :
English
Title :
Superparamagnetic colloids in viscous fluids
Publication date :
10 August 2017
Journal title :
Scientific Reports
eISSN :
2045-2322
Publisher :
Nature Publishing Group, London, United Kingdom
Volume :
7
Pages :
7778
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 16 September 2017

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